/* ==========================================================================
   计算类工具页通用骨架（.bk-page 作用域）
   设计语言：工程纸 / 深墨仪表盘 / 衬线标题 / 等宽数字
   用法：<div class="bk-page" data-accent="teal">，主色由 data-accent 切换
   ========================================================================== */

.bk-page {
    --bk-bg: #f7f4ed;
    --bk-card: #fffdf8;
    --bk-ink: #17130e;
    --bk-ink2: #57503f;
    --bk-ink3: #8c8474;
    --bk-line: #e3dbc9;
    --bk-line2: #efe8da;
    --bk-accent: #1d5c4a;
    --bk-accent-soft: #e7efe8;
    --bk-warm: #bd6a24;
    --bk-warm-soft: #fbeee0;
    --bk-serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
    --bk-mono: ui-monospace, "SF Mono", "Cascadia Mono", Consolas, monospace;

    background-color: var(--bk-bg);
    background-image:
        linear-gradient(rgba(60, 48, 30, .035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(60, 48, 30, .035) 1px, transparent 1px);
    background-size: 24px 24px;
    color: var(--bk-ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.76;
    -webkit-font-smoothing: antialiased;
}

.bk-page[data-accent="teal"] { --bk-accent: #0f6f68; --bk-accent-soft: #e2efed; }
.bk-page[data-accent="blue"] { --bk-accent: #25549b; --bk-accent-soft: #e6ecf7; }
.bk-page[data-accent="purple"] { --bk-accent: #5b48a8; --bk-accent-soft: #ece8f8; }
.bk-page[data-accent="amber"] { --bk-accent: #a8641c; --bk-accent-soft: #f9eddc; }
.bk-page[data-accent="rose"] { --bk-accent: #a63a55; --bk-accent-soft: #f8e6ea; }

:root[data-theme="dark"] .bk-page {
    --bk-bg: #100e0b;
    --bk-card: #191612;
    --bk-ink: #f3ecdf;
    --bk-ink2: #c4baa8;
    --bk-ink3: #8b8172;
    --bk-line: #2e2820;
    --bk-line2: #241f19;
    --bk-accent: #8fd7b4;
    --bk-accent-soft: #1c2c25;
    --bk-warm: #e0a463;
    --bk-warm-soft: #2b2115;
    background-image:
        linear-gradient(rgba(255, 240, 220, .028) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 240, 220, .028) 1px, transparent 1px);
}

:root[data-theme="dark"] .bk-page[data-accent="teal"] { --bk-accent: #6fd6cb; --bk-accent-soft: #142a27; }
:root[data-theme="dark"] .bk-page[data-accent="blue"] { --bk-accent: #8db8f0; --bk-accent-soft: #16212f; }
:root[data-theme="dark"] .bk-page[data-accent="purple"] { --bk-accent: #bda8f5; --bk-accent-soft: #211b33; }
:root[data-theme="dark"] .bk-page[data-accent="amber"] { --bk-accent: #e8b163; --bk-accent-soft: #2b2115; }
:root[data-theme="dark"] .bk-page[data-accent="rose"] { --bk-accent: #f0a0b5; --bk-accent-soft: #2e1820; }

.bk-page *,
.bk-page *::before,
.bk-page *::after { box-sizing: border-box; }

.bk-wrap { width: min(1140px, calc(100% - 44px)); margin: 0 auto; }
.bk-page a { color: inherit; text-decoration: none; }
.bk-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- 首屏：纸面 + 深墨操作台 ---------- */

.bk-hero {
    position: relative;
    overflow: hidden;
    padding: 24px 0 44px;
    border-bottom: 1px solid var(--bk-line);
}

.bk-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(560px 320px at 92% -10%, var(--bk-accent-soft), transparent 68%);
    opacity: .9;
    pointer-events: none;
}

.bk-hero > .bk-wrap { position: relative; z-index: 1; }

.bk-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 26px;
}

.bk-crumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    letter-spacing: .02em;
    color: var(--bk-ink3);
}

.bk-crumb a { color: var(--bk-ink2); border-bottom: 1px solid transparent; }
.bk-crumb a:hover { color: var(--bk-accent); border-bottom-color: var(--bk-accent); }
.bk-crumb i { font-style: normal; opacity: .45; }
.bk-crumb b { color: var(--bk-ink); font-weight: 600; }

.bk-modes {
    display: inline-flex;
    padding: 3px;
    gap: 2px;
    border: 1px solid var(--bk-line);
    border-radius: 3px;
    background: var(--bk-card);
}

.bk-modes button {
    border: 0;
    background: transparent;
    color: var(--bk-ink3);
    font: inherit;
    font-size: 12px;
    padding: 5px 11px;
    border-radius: 2px;
    cursor: pointer;
}

.bk-modes button.is-on { background: var(--bk-accent); color: #fffdf8; font-weight: 600; }

.bk-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, .94fr) minmax(0, 1.06fr);
    gap: 44px;
    align-items: start;
}

.bk-kicker {
    display: flex;
    align-items: center;
    gap: 9px;
    margin: 0 0 14px;
    font-family: var(--bk-mono);
    font-size: 10.5px;
    letter-spacing: .22em;
    color: var(--bk-accent);
    font-weight: 700;
}

.bk-kicker::before {
    content: "";
    width: 20px;
    height: 1px;
    background: var(--bk-accent);
    flex: none;
}

.bk-intro h1 {
    margin: 0 0 16px;
    font-family: var(--bk-serif);
    font-size: clamp(30px, 3.8vw, 46px);
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -.015em;
    color: var(--bk-ink);
}

.bk-intro h1 em {
    font-style: normal;
    color: var(--bk-accent);
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 6px;
    text-decoration-color: var(--bk-accent);
}

.bk-lede {
    margin: 0 0 18px;
    max-width: 31em;
    font-size: 14.5px;
    line-height: 1.95;
    color: var(--bk-ink2);
}

.bk-lede strong { color: var(--bk-ink); font-weight: 600; }

.bk-chips { list-style: none; margin: 0 0 18px; padding: 0; display: grid; gap: 8px; }

.bk-chips li {
    display: flex;
    gap: 10px;
    align-items: baseline;
    font-size: 12.5px;
    color: var(--bk-ink2);
}

.bk-chips b {
    flex: none;
    min-width: 38px;
    text-align: center;
    padding: 1px 6px;
    border: 1px solid var(--bk-line);
    border-radius: 2px;
    background: var(--bk-card);
    color: var(--bk-accent);
    font-family: var(--bk-mono);
    font-size: 10.5px;
    letter-spacing: .04em;
}

.bk-presets { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; }

.bk-presets > span {
    font-family: var(--bk-mono);
    font-size: 10.5px;
    letter-spacing: .1em;
    color: var(--bk-ink3);
}

.bk-presets button {
    font: inherit;
    font-size: 12.5px;
    padding: 5px 11px;
    border-radius: 3px;
    border: 1px solid var(--bk-line);
    background: var(--bk-card);
    color: var(--bk-ink2);
    cursor: pointer;
    transition: border-color .16s ease, color .16s ease, background .16s ease;
}

.bk-presets button:hover,
.bk-presets button.is-on {
    border-color: var(--bk-accent);
    background: var(--bk-accent-soft);
    color: var(--bk-accent);
}

/* ---------- 参数面板：深墨仪表盘 ---------- */

.bk-panel {
    --p-bg: #17251f;
    --p-panel: rgba(255, 255, 255, .035);
    --p-line: rgba(240, 232, 218, .15);
    --p-ink: #f2ebdd;
    --p-ink2: #bcc8c0;
    --p-ink3: #84948c;
    --p-accent: #8fd7b4;
    --p-warm: #e8b163;

    position: relative;
    background: var(--p-bg);
    color: var(--p-ink);
    border-radius: 4px;
    padding: 18px 20px 16px;
    box-shadow: 0 32px 60px -44px rgba(20, 14, 6, .75);
    overflow: hidden;
}

.bk-panel::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 3px;
    background: linear-gradient(90deg, var(--bk-accent), rgba(255, 255, 255, 0));
}

:root[data-theme="dark"] .bk-panel { --p-bg: #1a2a23; }

.bk-page[data-accent="teal"] .bk-panel { --p-accent: #6fd6cb; }
.bk-page[data-accent="blue"] .bk-panel { --p-accent: #8db8f0; }
.bk-page[data-accent="purple"] .bk-panel { --p-accent: #bda8f5; }
.bk-page[data-accent="amber"] .bk-panel { --p-accent: #e8b163; }
.bk-page[data-accent="rose"] .bk-panel { --p-accent: #f0a0b5; }

.bk-panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding-bottom: 10px;
    border-bottom: 1px dashed var(--p-line);
}

.bk-panel-head h2 {
    margin: 0;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: .02em;
    color: var(--p-ink);
}

.bk-panel-tag {
    font-family: var(--bk-mono);
    font-size: 9.5px;
    letter-spacing: .12em;
    padding: 2px 7px;
    border: 1px solid var(--p-line);
    border-radius: 2px;
    color: var(--p-accent);
}

.bk-col {
    margin-top: 10px;
    padding: 10px 12px 11px;
    border: 1px solid var(--p-line);
    border-radius: 3px;
    background: var(--p-panel);
}

.bk-col.is-b { border-color: rgba(232, 177, 99, .42); }

.bk-col-head {
    display: flex;
    align-items: center;
    gap: 7px;
    font-family: var(--bk-mono);
    font-size: 10px;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--p-ink3);
}

.bk-col-head i {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--p-accent);
    flex: none;
}

.bk-col.is-b .bk-col-head i { background: var(--p-warm); }

.bk-fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 12px;
    margin-top: 8px;
}

.bk-field { display: grid; gap: 3px; min-width: 0; }
.bk-field > span { font-size: 10.5px; color: var(--p-ink3); }

.bk-input {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0 8px;
    border: 1px solid var(--p-line);
    border-radius: 3px;
    background: rgba(0, 0, 0, .26);
    transition: border-color .16s ease, box-shadow .16s ease;
}

.bk-input:focus-within {
    border-color: var(--p-accent);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, .07);
}

.bk-field input {
    width: 100%;
    min-width: 0;
    border: 0;
    outline: none;
    background: transparent;
    color: var(--p-ink);
    -webkit-text-fill-color: var(--p-ink);
    font: inherit;
    font-family: var(--bk-mono);
    font-size: 12.5px;
    padding: 5px 0;
    font-variant-numeric: tabular-nums;
}

.bk-field em { flex: none; font-style: normal; font-size: 9.5px; color: var(--p-ink3); }

.bk-field select {
    width: 100%;
    min-width: 0;
    border: 0;
    outline: none;
    background-color: transparent;
    background-image:
        linear-gradient(45deg, transparent 50%, var(--p-ink3) 50%),
        linear-gradient(135deg, var(--p-ink3) 50%, transparent 50%);
    background-position: calc(100% - 9px) calc(50% + 1px), calc(100% - 5px) calc(50% + 1px);
    background-size: 4px 4px, 4px 4px;
    background-repeat: no-repeat;
    color: var(--p-ink);
    -webkit-text-fill-color: var(--p-ink);
    font: inherit;
    font-family: var(--bk-mono);
    font-size: 12px;
    padding: 5px 16px 5px 0;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
}

.bk-field select option { background: #17251f; color: #f2ebdd; }

.bk-summary {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    gap: 10px;
    align-items: end;
    margin-top: 12px;
    padding-top: 11px;
    border-top: 1px dashed var(--p-line);
}

.bk-summary > div:last-child { text-align: right; }
.bk-summary > div > span { display: block; font-size: 10px; letter-spacing: .04em; color: var(--p-ink3); }
.bk-summary b {
    display: block;
    margin-top: 1px;
    font-family: var(--bk-mono);
    font-size: 19px;
    font-weight: 600;
    letter-spacing: -.01em;
    font-variant-numeric: tabular-nums;
    color: var(--p-ink);
}
.bk-summary b span { display: inline; font: inherit; color: inherit; }
.bk-summary > div:first-child b { color: var(--p-accent); }
.bk-summary > div:last-child b { color: var(--p-warm); }
.bk-summary-mid { text-align: center; min-width: 0; }
.bk-summary-mid b { font-size: 13.5px; }

.bk-panel .bk-note {
    margin: 8px 0 0;
    font-size: 10.5px;
    line-height: 1.7;
    color: var(--p-ink3);
}

/* ---------- 正文 ---------- */

.bk-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 288px;
    gap: 30px;
    padding: 34px 0 30px;
    align-items: start;
}

.bk-main { display: grid; gap: 18px; min-width: 0; }
.bk-main > * { min-width: 0; }

.bk-card {
    position: relative;
    background: var(--bk-card);
    border: 1px solid var(--bk-line);
    border-radius: 4px;
    padding: 22px 24px 24px;
}

.bk-card::before {
    content: "";
    position: absolute;
    left: 24px;
    top: 0;
    width: 44px;
    height: 2px;
    background: var(--bk-accent);
}

.bk-card-head { margin-bottom: 12px; }

.bk-card-head h2 {
    margin: 0;
    display: flex;
    align-items: center;
    gap: 9px;
    flex-wrap: wrap;
    font-family: var(--bk-serif);
    font-size: 19px;
    font-weight: 700;
    letter-spacing: -.01em;
}

.bk-card-head h2 i {
    display: inline-grid;
    place-items: center;
    min-width: 26px;
    height: 21px;
    padding: 0 5px;
    border-radius: 2px;
    background: var(--bk-accent);
    color: #fffdf8;
    font-style: normal;
    font-family: var(--bk-mono);
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: .04em;
}

.bk-card-head p { margin: 6px 0 0; font-size: 12.5px; line-height: 1.8; color: var(--bk-ink3); }

.bk-stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-top: 14px;
}

.bk-stats > div { padding: 10px 12px; border-top: 2px solid var(--bk-line); }
.bk-stats > div.is-key {
    border-top-color: var(--bk-accent);
    background: var(--bk-accent-soft);
    border-radius: 0 0 3px 3px;
}

.bk-stats span {
    display: block;
    font-family: var(--bk-mono);
    font-size: 10px;
    letter-spacing: .06em;
    color: var(--bk-ink3);
}

.bk-stats b {
    display: block;
    margin-top: 3px;
    font-family: var(--bk-mono);
    font-size: 19px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    color: var(--bk-ink);
}

.bk-stats b span { display: inline; font: inherit; color: inherit; }

.bk-bars { display: grid; gap: 9px; margin-top: 14px; }

.bk-bar-row {
    display: grid;
    grid-template-columns: 74px minmax(0, 1fr) 96px;
    gap: 10px;
    align-items: center;
}

.bk-bar-label { font-family: var(--bk-mono); font-size: 10.5px; letter-spacing: .04em; color: var(--bk-ink3); }

.bk-bar-track {
    display: flex;
    height: 12px;
    border-radius: 2px;
    overflow: hidden;
    background: var(--bk-line2);
}

.bk-bar-track i { display: block; height: 100%; width: 0; transition: width .3s ease; }
.bk-bar-track i:nth-child(1) { background: var(--bk-accent); }
.bk-bar-track i:nth-child(2) { background: #4fa88b; }
.bk-bar-track i:nth-child(3) { background: #8ecdb6; }
.bk-bar-track i:nth-child(4) { background: var(--bk-warm); }
.bk-bar-track i:nth-child(5) { background: #e8b163; }
.bk-bar-track i:nth-child(6) { background: #c9d8d1; }

.bk-bar-sum {
    text-align: right;
    font-family: var(--bk-mono);
    font-size: 12px;
    font-variant-numeric: tabular-nums;
    color: var(--bk-ink2);
}

.bk-legend {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 6px 16px;
    margin: 12px 0 0;
    padding: 0;
    font-size: 11.5px;
    color: var(--bk-ink3);
}

.bk-legend i { display: inline-block; width: 8px; height: 8px; border-radius: 1px; margin-right: 6px; }
.bk-legend b { font-family: var(--bk-mono); font-weight: 600; color: var(--bk-ink2); }

.bk-table-wrap { margin-top: 12px; overflow-x: auto; border: 1px solid var(--bk-line); border-radius: 3px; }

.bk-table { width: 100%; min-width: 520px; border-collapse: collapse; font-size: 12.5px; }

.bk-table th,
.bk-table td {
    padding: 9px 12px;
    text-align: right;
    border-bottom: 1px solid var(--bk-line2);
    white-space: nowrap;
}

.bk-table th {
    border-bottom: 1px solid var(--bk-line);
    background: transparent;
    color: var(--bk-ink3);
    font-family: var(--bk-mono);
    font-size: 10px;
    letter-spacing: .06em;
    font-weight: 600;
    text-transform: uppercase;
}

.bk-table th:first-child, .bk-table td:first-child { text-align: left; }
.bk-table td { font-family: var(--bk-mono); font-variant-numeric: tabular-nums; }
.bk-table td.txt { font-family: inherit; }
.bk-table tbody tr:last-child td { border-bottom: 0; }
.bk-table tbody tr:hover td { background: var(--bk-line2); }
.bk-table tr.is-key td { background: var(--bk-accent-soft); font-weight: 700; }
.bk-table tr.is-warn td:last-child { color: var(--bk-warm); }

.bk-list { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 12px; }
.bk-list > div { padding: 10px 12px; border-top: 1px solid var(--bk-line); border-left: 2px solid var(--bk-accent); }
.bk-list b { display: block; font-size: 12.5px; }
.bk-list span { display: block; margin-top: 3px; font-size: 11.5px; line-height: 1.75; color: var(--bk-ink3); }

.bk-formula {
    margin-top: 12px;
    padding: 12px 14px;
    border: 1px dashed var(--bk-line);
    border-radius: 3px;
    background: rgba(120, 96, 60, .045);
    font-family: var(--bk-mono);
    font-size: 11.5px;
    line-height: 2;
    color: var(--bk-ink2);
    overflow-x: auto;
}

:root[data-theme="dark"] .bk-formula { background: rgba(255, 240, 220, .04); }

.bk-notes { display: grid; margin-top: 12px; }

.bk-notes > div {
    position: relative;
    padding: 12px 0 12px 14px;
    border-top: 1px dashed var(--bk-line);
    font-size: 12.5px;
    line-height: 1.85;
    color: var(--bk-ink2);
}

.bk-notes > div:first-child { border-top: 0; }

.bk-notes > div::before {
    content: "";
    position: absolute;
    left: 0;
    top: 19px;
    width: 5px;
    height: 5px;
    background: var(--bk-accent);
}

.bk-notes b { color: var(--bk-ink); font-weight: 700; }

.bk-note { margin: 10px 0 0; font-size: 11.5px; line-height: 1.75; color: var(--bk-ink3); }

.bk-tip {
    margin: 12px 0 0;
    padding: 11px 13px;
    border-left: 2px solid var(--bk-warm);
    background: var(--bk-warm-soft);
    font-size: 11.5px;
    line-height: 1.8;
    color: var(--bk-ink2);
}

.bk-faq details { border-top: 1px dashed var(--bk-line); }
.bk-faq details:first-of-type { border-top: 0; }

.bk-faq summary {
    position: relative;
    list-style: none;
    cursor: pointer;
    padding: 12px 30px 12px 0;
    font-size: 13.5px;
    font-weight: 600;
    line-height: 1.7;
}

.bk-faq summary::-webkit-details-marker { display: none; }

.bk-faq summary::after {
    content: "+";
    position: absolute;
    right: 2px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--bk-mono);
    font-size: 16px;
    color: var(--bk-accent);
    transition: transform .2s ease;
}

.bk-faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.bk-faq p { margin: 0; padding: 0 18px 13px 0; font-size: 12.5px; line-height: 1.95; color: var(--bk-ink2); }

/* ---------- 侧栏 ---------- */

.bk-rail { position: sticky; top: 22px; display: grid; gap: 14px; }

.bk-rail-card {
    background: var(--bk-card);
    border: 1px solid var(--bk-line);
    border-radius: 4px;
    padding: 16px 17px 17px;
}

.bk-rail-card h3 {
    margin: 0 0 10px;
    padding-bottom: 8px;
    border-bottom: 1px dashed var(--bk-line);
    font-family: var(--bk-mono);
    font-size: 10px;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--bk-ink3);
    font-weight: 700;
}

.bk-rail-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.bk-rail-list li { display: flex; justify-content: space-between; gap: 10px; font-size: 12px; color: var(--bk-ink2); }

.bk-rail-list b {
    font-family: var(--bk-mono);
    font-weight: 600;
    color: var(--bk-ink);
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.bk-links { display: grid; }

.bk-links a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    padding: 9px 0;
    border-bottom: 1px dashed var(--bk-line);
    font-size: 12.5px;
    color: var(--bk-ink2);
    transition: color .16s ease;
}

.bk-links a:last-child { border-bottom: 0; }
.bk-links a:hover { color: var(--bk-accent); }

.bk-links a::after {
    content: "→";
    font-family: var(--bk-mono);
    opacity: .45;
}

.bk-rail-note { margin: 0; font-size: 11.5px; line-height: 1.85; color: var(--bk-ink3); }

@media (max-width: 1020px) {
    .bk-hero-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
    .bk-body { grid-template-columns: minmax(0, 1fr); }
    .bk-rail { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
    .bk-wrap { width: calc(100% - 28px); }
    .bk-hero { padding: 20px 0 30px; }
    .bk-intro h1 { font-size: 27px; }
    .bk-lede { font-size: 14px; }
    .bk-panel { padding: 15px 14px 14px; }
    .bk-card { padding: 18px 16px; }
    .bk-card::before { left: 16px; }
    .bk-card-head h2 { font-size: 17px; }
    .bk-stats { grid-template-columns: 1fr 1fr; gap: 10px; }
    .bk-list { grid-template-columns: minmax(0, 1fr); }
    .bk-rail { grid-template-columns: minmax(0, 1fr); }
    .bk-summary { grid-template-columns: 1fr; gap: 8px; }
    .bk-summary > div:last-child, .bk-summary-mid { text-align: left; }
    .bk-fields { grid-template-columns: 1fr 1fr; }
    .bk-bar-row { grid-template-columns: 60px minmax(0, 1fr) 78px; }
    .bk-bar-label { font-size: 10px; }
}

@media (prefers-reduced-motion: reduce) {
    .bk-page *,
    .bk-page *::before,
    .bk-page *::after {
        transition: none !important;
        animation: none !important;
    }
}